70215139 has 2 divisors, whose sum is σ = 70215140. Its totient is φ = 70215138.

The previous prime is 70215097. The next prime is 70215157. The reversal of 70215139 is 93151207.

It is a strong prime.

It is an emirp because it is prime and its reverse (93151207) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70215139 - 2¹⁷ = 70084067 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (70215239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35107569 + 35107570.

It is an arithmetic number, because the mean of its divisors is an integer number (35107570).

Almost surely, 2^70215139 is an apocalyptic number.

70215139 is a deficient number, since it is larger than the sum of its proper divisors (1).

70215139 is an equidigital number, since it uses as much as digits as its factorization.

70215139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 70215139 is about 8379.4474161486. The cubic root of 70215139 is about 412.5503120757.

The spelling of 70215139 in words is "seventy million, two hundred fifteen thousand, one hundred thirty-nine".